Rotary swaging and forging machines



May 18, 1965 5. SMITH 3,183,704

ROTARY SWAGING AND FORGING MACHINES Filed March 29, 1963 United States Patent 3,183,704 RQTARY SWAGlNG AND FORGING MACHINES Samuel Smith, Elmdon, England, assignor to Stevens & Bullivant Limited, Birmingham, England, a British company Filed Mar. 29, 1963, Ser. No. 268,984 1 Claim. (Cl. 72-402) The present invention has relation to rotary swaging and forging machines of the type involving a flywheel carrying circumferentially disposed rollers which is rotatably driven on a stationary head carrying radially slidable hammer blocks, the present invention being concerned with means for the positive withdrawal of the hammer blocks from the operative position.

According to the present invention there is provided a rotary swaging and forging machine wherein cam members are adapted to co-operate with the hammer blocks and rollers to effect the positive withdrawal of said hammer blocks to their retracted position.

In order that the invention may be clearly understood and readily carried into practice reference may be had to the appended explanatory drawings, in which:

The figure illustrates in elevation swaging or forging mechanism incorporating cam members in accordance with the present invention.

In a convenient embodiment of the present invention, there is provided a rotary flywheel a carrying circumferentially disposed rollers a a which operate upon a stationary bead 12 wherein radially sliding hammer blocks 0 and hammers c are incorporated for displacement by the rollers a in the swaging or forging operation. The hammer blocks 0 are of rectangular section and operate in radial accommodating slots in the head and are finally located by a cover piece (not shown) in order that they can slide radially but have no lateral movement.

Each hammer block 0 is provided at its outer extremity with a curved or arcuate head c flat on its underside c which head is normally spaced slightly clear of a corresponding flat face b on the stationary head b and two or more compression springs d are employed beneath the head of each hammer block and these compression springs enter blind apertures b of considerable depth in the stationary head b so as to normally tend to thrust the hammer blocks outwardly conveniently by means of studs d The inner extremity of each hammer block c is itself in the form of a head 0 which shoulders against the adjacent part b of the stationary head b of the machine and this hammer block head 0 has a cavity which is undercut so that a flanged or keyed hammer 0 may be located therein. This obtains in the case of each of the four hammers and in this respect the present forging machine is particularly suitable for shaping, for example, the flattened extremity of a tool such as a chisel. Alternate rollers a are grooved in well known manner so that they miss the curved heads 0 of the hammer blocks whereby, for example, the vertical hammer blocks c operate simultaneously and then the horizontal blocks, the said hammer blocks in each instance being returned by the compression springs d which permit the hammer blocks being driven fully home so that their heads c shoulder on the stationary faces b of the stationary head b of the machine.

It has been found in practice that there is occasionally a tendency for the hammer block to remain in its closed position owing to the springs jamming. In order to overcome this tendency a rockable cam e of a bell crank type is associated with each hammer block 0. One arm e of the cam e is located under the flanged head c c of the hammer block c, whilst the end of the other arm e of the cam normally lies in the path of the rollers a and is adapted to be rocked by the rollers a to positively withdraw the hammer block c from its advanced position. This assisted return movement of the hammer blocks c is effected by the engagement of the rollers a on the arm 2 of the cams which protrude into the path of the rollers a The cam e moving on its pivot e moves the arm e of the cam under the flanged hammer head c c to move the hammer block to its retracted position.

The width of the cams e which operate in cavities b of the head b is such that the gapped rollers will pass over said cams without operating same and the pivot e may be in the form of trunnions for operating in bearings in the fixed head of the machine.

I claim:

A rotary swaging and forging machine comprising in combination a flywheel carrying circumferentially disposed rollers rotatably driven on a stationary head carrying radially slidable hammer blocks, said hammer blocks having a flanged head, said rollers being arranged to engage said flanged heads for actuating the hammer blocks to an inward position, a cam of the bell crank type rockable in relation to the stationary head of the machine, one arm of the cam being adapted to co-operate with the underside of the flanged head of the hammer block and the other arm adapted to enter the path of the rollers for its displacement thereby to positively return the hammer block to an outward position.

References Cited by the Examiner UNITED STATES PATENTS 1,580,949 4/26 Berg 78-21 3,064,508 11/62 Smith 7 822 FOREIGN PATENTS 903,403 2/54 Germany.

WILLIAM J. STEPHENSON, Primary Examiner. 

